how to fix P0300 misfire code in Ford F-150 14th Generation (2021-2024)

Learn how to diagnose and fix P0300 random/multiple cylinder misfire in Ford F-150 (2021-2024). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather all tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Spark Plug and Ignition Coil Replacement

• Tools Required: Socket set, torque wrench, pliers, dielectric grease.
• Remove the engine cover (if applicable) to access the spark plugs and ignition coils.
• Disconnect the electrical connectors from the ignition coils.
• Remove the bolts securing the ignition coils and carefully pull them out.
• Remove the old spark plugs using a spark plug socket, taking care not to damage the threads.
• Install new spark plugs, tightening to the manufacturer's specified torque (usually around 13-15 lb-ft).
• Apply dielectric grease to the inside of the ignition coil boots.
• Reinstall the ignition coils and secure them with bolts.

3. Fuel Injector Inspection and Replacement

• Tools Required: Fuel pressure gauge, injector puller (if necessary).
• Connect a fuel pressure gauge to the fuel rail and check for proper fuel pressure (refer to specifications).
• If pressure is low, inspect the fuel pump and filter; replace as needed.
• If fuel injectors are suspected, carefully remove them from the fuel rail.
• Clean or replace the fuel injectors, ensuring proper sealing and connection upon reinstallation.

4. Compression Testing

• Tools Required: Compression tester.
• Remove spark plugs again for easier access to the cylinders.
• Insert the compression tester into each cylinder and crank the engine.
• Record the compression readings and compare them to the manufacturer's specifications.
• If compression is low, further investigation may be needed for potential engine repairs.